Hi and welcome @Hadtochangeforthisone ! I think Toast can perfectly suit a capsule wardrobe that's both casual and appropriate for a high profile police environment - i.e. it's suitable to presentations, meetings, tv. And I also think £1k is doable to get you started. FWIW, I spent about £800 when I started overhauling my wardrobe a few years back, then I spent a couple of years just collecting basics from the sales. Of course I then lost it with the summer 2022 sale and have bought loads in the sales since - I need to start curbing that!!!
I'd sugest patience to wait for a sale and have a credit card limit that will allow you to pounce on every possible item so that you can see what really suits you IRL. So, for instance, with this sale I kept 1/5th of what I spent in monetary terms (£ not # of items), and there were surprising things that I kept, and things that I presumed would be obvious keepers turned out not to be. Also, with Toast it's been hard to work out what the fit will be like so I've taken to buying two sizes quite often as items might sell out before you get your package and learn that the thing of beauty is no longer available.
With regard to comfortable tummies, over the last few years dresses tend to be loose around the middle, more trousers have been elasticated, and tops a-line. I've read that the larger/looser fitting designs have been generated out of the pandemic, so at some point I expect there to be a swing back. For this reason I think it would be a good idea to buy more of the things you love while they're in fashion. For me, I love the pleated trousers, which also come in and out of fashion, so this is something I bought several of.
I don't know when the next sale will be, can't recall if there's usually a spring time one but that would make sense, the summer one should have loads.
A few us of here have largley Toasty wardrobes - for me I think this makes getting dressed really easy as the seperates tend to go together nicely, but the brand also fits nicely with COS and Arket - and they're cheaper.
We'll enjoy hearing about your purchases and thinking here if you care to share!